WHAT IS IT?
Biogas comes from wet organic waste. It’s a clean,
renewable resource that is safe for the environment. It
can...
WHERE DOES IT COME FROM?
As mentioned before, biogas comes from wet organic waste,
such as manure from livestock.
Cow manu...
WHAT’S AN ANAEROBIC DIGESTER?
Now, this is where the waste is treated. After the waste is
“harvested” from livestock pens ...
THE PROCESS OF ANAEROBIC DIGESTION
There are three steps to anaerobic digestion…
1. Hydrolosis- polymers that can’t dissol...
3 STEPS
2. Acidogenesis- Acids formed in the last stage
are changed by acetogenic micro-organisms to
acetic acid. CO2 and ...
3 STEPS
3. Methanogenesis- Methane and CO2 are
produced from the acids in the acidogenic
phase. This is when the actual fu...
DIAGRAM OF ANAEROBIC DIGESTION
HOW DO YOU GET THE POWER FROM THE
FUEL?
What you can do is buy a reciprocating engine or a microturbine to convert
the vio...
Biogas digestion
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Biogas digestion

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Biogas digestion

  1. 1. WHAT IS IT? Biogas comes from wet organic waste. It’s a clean, renewable resource that is safe for the environment. It can replace fossil fuels and firewood to use for heating and lighting.
  2. 2. WHERE DOES IT COME FROM? As mentioned before, biogas comes from wet organic waste, such as manure from livestock. Cow manure actually contains 60% methane, which can be used for energy instead of being emitted into the air.
  3. 3. WHAT’S AN ANAEROBIC DIGESTER? Now, this is where the waste is treated. After the waste is “harvested” from livestock pens it is taken to this tank called an anaerobic digester. The methane is concentrated for productive use while the sludge left behind, full of nutrients, is used as an effective fertilizer for the grass. The livestock eat the grass and it’s like a cycle.
  4. 4. THE PROCESS OF ANAEROBIC DIGESTION There are three steps to anaerobic digestion… 1. Hydrolosis- polymers that can’t dissolve like carbohydrates and cellulose are broken down by bacteria and liquefied. They are hydrolised into sugar which can then be decomposed into CO2 and hydrogen. In this phase the gas levels rise and the solid levels go down.
  5. 5. 3 STEPS 2. Acidogenesis- Acids formed in the last stage are changed by acetogenic micro-organisms to acetic acid. CO2 and hydrogen levels decrease.
  6. 6. 3 STEPS 3. Methanogenesis- Methane and CO2 are produced from the acids in the acidogenic phase. This is when the actual fuel shows up with methanogenic bacteria that help break down the biogas even further. It’s important in this stage to mix the bacteria to move the process along, so make sure the slurry is mixed in as well.
  7. 7. DIAGRAM OF ANAEROBIC DIGESTION
  8. 8. HOW DO YOU GET THE POWER FROM THE FUEL? What you can do is buy a reciprocating engine or a microturbine to convert the viogas into electricity.

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